Magnetek Quattro DC Elevator Drive Benutzerhandbuch

 

 

NOTCH FILTER FRQ 
(Notch Filter Center Frequency) 
Although originally created for gearless 
applications where elevator rope resonance is 
sometimes an issue, this filter affects the 
torque command output of the speed regulator 
and will filter out specific frequencies.  By 
filtering a specific frequency, the speed 
regulator will avoid exciting a mechanical 
resonance if one exists at that frequency. 
There is attenuation across a range of 
frequencies, not just at the set frequency, but 
also to a lesser degree.  The filter starts 
attenuation at frequencies lower than the notch 
frequency set point.  When the notch 
frequency is set to low values (less than 10 
Hz), the filter can interfere with the desired 
response of the drive.  This can be exhibited 
by minor increase in the rollback of the drive at 
start and some deterioration in the ability of the 
drive to track an s-curve reference.  Generally, 
this would not be an issue if the notch 
frequency were set at or above 10 Hz. 

 
Notch Filter Example settings: 
NOTCH FILTER FRQ (A1) = 20Hz 
NOTCH FILT DEPTH (A1) = 50% and 100% 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

1

10

 

100

-30

-25

-20

-10

-5

0

Frequency 
(Hz)

 

Attenuation 
(dB)

 

-15

38